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United States Patent | 5,745,855 |
Futamura | April 28, 1998 |
Through a technique such as a carrier sense system or the like, a mobile station (14) identifies a base station (12) (requested base station) by which the mobile station is to be controlled. In response to polling from a key station (10), the base station informs the key station (10) of the requested base station. When the key station (10) performs the polling to know that a receiving base station which obtained the response is different from the requested base station, the next polling will be made through both the base stations (12). If the key station receives the response from the requested base station, the key station switches the base station controlled by itself from one to another.
Inventors: | Futamura; Yoshisumi (Toyota, JP) |
Assignee: | Toyota Jidosha Kabushiki Kaisha (Toyota, JP) |
Appl. No.: | 519728 |
Filed: | August 28, 1995 |
Aug 26, 1994[JP] | 6-202175 | |
Aug 08, 1995[JP] | 7-202633 |
Current U.S. Class: | 455/517; 455/524 |
Intern'l Class: | H04B 007/26 |
Field of Search: | 455/53.1,54.1,52.1,33.1-34.1,67.1,507,517,524,525 340/825.08,825.54,505 342/50,51 |
5058201 | Oct., 1991 | Ishii et al. | 455/33. |
5257406 | Oct., 1993 | Ito | 455/33. |
5329576 | Jul., 1994 | Handforth | 455/33. |
Foreign Patent Documents | |||
63-209235 | Aug., 1988 | JP. | |
64-9508 | Jan., 1989 | JP. | |
3-34632 | Feb., 1991 | JP. | |
3-243026 | Oct., 1991 | JP. | |
5-168059 | Jul., 1993 | JP. | |
5-252089 | Sep., 1993 | JP. | |
6-237212 | Aug., 1994 | JP. |
International Electrotechnical Commission (IEC) proposal of SC65C. Physical Layer Specification and Service Definition Radio Medium. Proposed clauses 18, 19 and 20 of DIS document 65C(C.O.)34. Mar. 26, 1993. |